ENH: user_guide/getting_started: Mark "clinical use" warning as such

[ci skip]

Author: jcfr

Docs/user_guide/getting_started.rst

@@ -20,7 +20,9 @@ Features include:
 * Support for multi-modality imaging including, MRI, CT, US, nuclear medicine, and microscopy.
 * Bidirectional interface for devices.
 
-There is no restriction on use, but Slicer is not approved for clinical use and intended for research. Permissions and compliance with applicable rules are the responsibility of the user. For details on the license see `here <https://www.slicer.org/wiki/License>`_.
+.. important::
+
+  There is no restriction on use, but Slicer is **NOT** approved for clinical use and intended for research. Permissions and compliance with applicable rules are the responsibility of the user. For details on the license see `here <https://www.slicer.org/wiki/License>`_.
 
 
 Hardware Requirements